Data from: Detection of Ring and Adatom Defects in Activated Disordered Carbon via Fluctuation Nanobeam Electron Diffraction

The carbon data was measured on an electron microscope in a commercial file format (.ser). Carbon data consists of 6 data files (944Mb each) and each contains many images. Gold nanocrystal diffraction data is a single raw binary format that contains many images. Script provided to access these files via Python.Data supporting published article: https://doi.org/10.1002/smll.202000828Article abstract: How the structure of disordered porous carbons evolve during their activation is particularly poorly understood. This problem endures primarily because of a lack of high-resolution 3D techniques for the characterization of amorphous and highly disordered structure. To address this, the measurement of the 3D pair-angle distribution function using nanodiffraction patterns from high-energy electrons is demonstrated. These rich multiatom correlations are measured for a disordered carbon and they clearly show the structural evolution during activation. They provide previously inaccessible bond-angle information and direct evidence for the presence of ring and adatom defects. An increase in the short-range order and the number of fivefold ring defects with activation are observed, indicating stress relaxation by increasing curvature. These observations support models of disordered porous carbons based on curved graphene networks and explain how large amounts of free volume can be created with surprisingly small changes in the average ratios of tetrahedral to graphitic bonding.

本数据集的碳数据采用商用文件格式（.ser）在电子显微镜（electron microscope）下测得。碳数据包含6个数据文件（单文件大小为944Mb），每个文件内含多张图像。金纳米晶体衍射数据采用单一原始二进制格式存储，其中包含多张图像。本数据集附带可通过Python读取上述文件的脚本。本数据集支持以下已发表学术论文：https://doi.org/10.1002/smll.202000828。论文摘要：无序多孔碳在活化过程中的结构演化机制目前仍极不明确。该问题长期存在的核心原因在于，缺乏可用于表征无定形且高度无序结构的高分辨率三维表征技术。为解决这一难题，本研究展示了利用高能电子纳米衍射（nanodiffraction）图样测量三维对角度分布函数（pair-angle distribution function）的方法。研究针对无序碳材料测得了丰富的多原子关联信号，清晰揭示了活化过程中的结构演化历程。该测量结果提供了此前无法获取的键角（bond-angle）信息，以及环缺陷与吸附原子（adatom）缺陷存在的直接证据。观测结果显示，随着活化进程推进，材料的短程有序度与五元环缺陷数量均有所提升，表明通过增加曲率实现了应力松弛。上述观测结果支持了基于弯曲石墨烯网络的无序多孔碳模型，并解释了为何仅需平均四面体键合（tetrahedral bonding）与石墨键合（graphitic bonding）比例发生极小变化，即可创造出大量自由体积。